Note about secret entrance in Doom II mod Reds Over World

Schism is a gameplay mod for Doom based on Brutal Doom, combining magic, melee combat, and firearms. The mod adds new classes, weapons, and enemies, overhauls the balance, and immerses classic Doom in bloody dark fantasy.

Half-Life: The Legacy Collection is a project to "restore" classic Half-Life releases and add-ons, bringing back a number of original effects, menus and settings in the spirit of the 1999-2001 editions.

Diablo The Awakening is an extensive mod for the original Diablo that expands the story after the destruction of Baal and the Worldstone. It adds entirely new monsters and bosses, additional spells, quests, as well as regular and unique items — all with updated affixes and increased difficulty.

OpenTyrian2000 - an open source port of the Tyrian game, aimed at reproducing the Tyrian 2000 gaming experience as accurately as possible.

Heroes of Might and Magic III: The Succession Wars is a major mod that ports HoMM2 content to the HoMM3 engine. The mod recreates classic and introduces new factions, castles, units, artifacts, music, and the characteristic visual style, adds original scenarios and improves the interface, showing respect for the HoMM2 legacy.